Form 4 for MBX MBX Biosciences, Inc.
Accepted 2026-02-03 00:00:00 ET · period of report 2026-02-02 · accession 0001193125-26-035584 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-02-03 | 2026-02-02 | MBX | Bartram Richard | CFO | A - Grant | $0.00 | +15.0K | 15.0K | New | $0 |
| D | 2026-02-03 | 2026-02-02 | MBX | Bartram Richard | CFO | A - Grant | $0.00 | +70.0K | 70.0K | New | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-02-02 | A | A | 15,000 | $0.00 | 15,000 | D | — | — | (F1) Represents the grant of restricted stock units (RSUs). The RSUs will vest over a four (4) year period in equal quarterly installments, subject to the Reporting Person's continued service on such vesting date. |
| 2 | Derivative | Stock option (right to buy) | 2026-02-02 | A | A | 70,000 | $0.00 | 70,000 | D | $39.07 · — to 2036-02-02 | 70,000 Common Stock | (F2) The shares underlying this option vest and become exercisable in forty eight (48) equal monthly installments, beginning on March 2, 2026, subject to the Reporting Person's continued service on such vesting date. |